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Fair Value - Summary of Quantitative Information about Level 3 Fair Value Measurements (Details) - USD ($) $ in Millions | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | $ 94,509 | $ 79,400 | $ 80,250
Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | 108 | 100 | 105
Fair Value, Inputs, Level 3 | Total Quantitative Level Three Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | 74 | 77 | 80
Fair Value, Inputs, Level 3 | Third Party Pricing Exemption Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | 34 | 23 | 25
Fair Value, Inputs, Level 3 | Corporate and other debt securities | Total Quantitative Level Three Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | $ 5 | $ 3 | 5
Fair value inputs, market cap price change percentage, range, minimum | (1.40%) | (1.00%) | (3.10%) |
Fair value inputs, market cap price change percentage, range, maximum | (1.30%) | (0.90%) | 10.90% |
Fair value inputs, market cap price change percentage, weighted average | (1.40%) | (1.00%) | 2.60% |
Fair Value, Inputs, Level 3 | Nonredeemable preferred stocks | Total Quantitative Level Three Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | $ 60 | $ 52 | 52
Fair value inputs, market cap price change percentage, range, minimum | (14.10%) | (6.60%) | 4.00% |
Fair value inputs, market cap price change percentage, range, maximum | 6.00% | 11.30% | 25.00% |
Fair value inputs, market cap price change percentage, weighted average | (2.70%) | 3.80% | 18.10% |
Fair Value, Inputs, Level 3 | Common equities | Total Quantitative Level Three Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investments, fair value |  | $ 9 | $ 22 | $ 23
Fair value inputs, market cap price change percentage, range, minimum | (41.30%) | (21.50%) | (19.10%) |
Fair value inputs, market cap price change percentage, range, maximum | 95.90% | 74.60% | 69.60% |
Fair value inputs, market cap price change percentage, weighted average | 6.00% | 11.30% | 19.00% |

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